1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 20 SAE International All rights reserved. No part of this publication may
3、 be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) F
4、ax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS3281E AEROSPACE MATERIAL SPECIFICATION AMS3281 REV. E Issued 1994-11 Revised 2010-12Superseding
5、 AMS3281D Sealing Compound, Polysulfide (T) Synthetic Rubber for Integral Fuel Tank and Fuel Cell Cavities Low Density for Intermittent Use to 360 F (182 C) RATIONALE Resistance to thermal rupture was removed from initial acceptance testing and specific gravity is added to initial acceptance testing
6、. Several formatting changes were also made to bring the specification more in-line with current standards. 1. SCOPE 1.1 Form This specification covers three types and three classes of fuel-resistant polysulfide (T) sealing compound with low specific gravity, supplied as a two-component system which
7、 cures at room temperature. 1.2 Application This sealing compound has been used typically in sealing aircraft integral fuel tanks, fuel tank fillets and faying surfaces, pressure barriers and moldline surfaces, but usage is not limited to such applications. The sealing compound is resistant to jet f
8、uels and is capable of withstanding long-term exposure from -65 to +250 F (-54 to +121 C) and short-term exposure (6 hours) to 360 F (182 C). 1.3 Classification Type 1 - Sealing compound with a specific gravity of 1.20 to 1.35. Type 2 - Sealing compound with a specific gravity of 1.06 to 1.19. Type
9、3 - Sealing Compound with a specific gravity of 1.05 or less. 1.3.1 Sealing compounds covered by this specification are classified by method of application and application times as follows: Class A Suitable for application by brushing, injecting, or spraying. Available with the following application
10、 times in hours: A-1/2 A-2 Class B Suitable for application by extrusion gun or spatula. Available with the following application times in hours: B-1/2 B-2 10Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from I
11、HS-,-,-SAE AMS3281E Page 2 of 16Class C Suitable for faying surface or shim sealing, brush coating, or wet installation. Available with the following application times in hours: Notation: ( ) Assembly time in hours. C-2(2) C-8(24) C-12(48) C-48(168) C-96(336) 1.4 Safety - Hazardous Materials Shall b
12、e in accordance with AS5502 (1.1). 2. APPLICABLE DOCUMENTS Shall be in accordance with AS5502 (2.). 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), or www.sae.org.AMS247
13、1 Anodic Treatment of Aluminum Alloys, Sulfuric Acid Process, Undyed Coating AMS2629 Fluid, Jet Reference AMS3020 Oil, Reference, for “L” Stock Rubber Testing AMS3021 Fluid, Reference, for Testing Di-ester (Polyol) Resistant Material AMS3100 Adhesion Promoter, for Polysulfide Sealing Compounds AMS32
14、76 Sealing Compound, Integral Fuel Tanks and General Purpose, Intermittent Use to 360 F (182 C) AMS4045 Aluminum Alloy Sheet and Plate, 5.6Zn - 2.5Mg - 1.6 Cu - 0.23 Cr, 7075: (-T6 Sheet, -T651 Plate), Solution and Precipitation Heat Treated AMS4911 Titanium Alloy, Sheet, Strip, and Plate, 6Al - 4V,
15、 Annealed AMS5516 Steel, Corrosion-Resistant, Sheet, Strip, and Plate, 18Cr - 9.0Ni (SAE 30302), Solution Heat Treated AMS-C-27725 Coating, Corrosion Preventive, for Aircraft Integral Fuel Tanks for Use to 250 F (121 C) AS5127 Methods for Testing Aerospace Sealants AS5127/1 Aerospace Standard Test M
16、ethods for Aerospace Sealants, Two-Component Synthetic Rubber Compounds AS5502 Standard Requirements for Aerospace Sealants Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3281E Page 3 of 162.
17、2 U.S. Government Publications Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/.MIL-PRF-23377 Primer Coatings: Epoxy Polyamide, Chemical and Solvent Resistant
18、 MIL-DTL-81706 Chemical Conversion Materials for Coating Aluminum and Aluminum Alloys MIL-PRF-85285 Coating, Polyurethane, High Solids MIL-PRF-85582 Primer Coatings, Epoxy, Waterborne 2.3 PRI Publications Available from PRI, 161 Thorn Hill Road, Warrendale, PA 15086-7527, Tel: 724-772-1616, www.pri-
19、network.org.PD 2000 Procedures for an Industry Qualified Product Management Process 3. TECHNICAL REQUIREMENTS 3.1 Materials The basic ingredient shall be synthetic rubber, made from liquid polysulfide and derivations thereof. The sealing compound shall cure by the addition of a separate curing agent
20、 to the base compound and shall not depend on solvent evaporation for curing. The curing agent shall possess sufficient color contrast to the base compound to permit easy identification of an unmixed or incompletely mixed sealing compound. Neither the base compound nor the cured sealing compound sha
21、ll be red or pink in color. No glass fillers shall be used. 3.1.1 Qualification All products sold to this specification shall be listed, or approved for listing, on the PRI qualified products list. The qualified products list shall be in accordance with PD 2000. 3.2 Date of Packaging Shall be in acc
22、ordance with AS5502 (3.1). 3.3 Toxicological Formulations Shall be in accordance with AS5502 (3.2). 3.4 Quality Shall be in accordance with AS5502 (3.3). 3.5 Shelf Life Shelf life shall be a minimum of 9 months from the date of packaging. Material may be retested for shelf life extension. 3.5.1 Prem
23、ixed and Frozen Material Premixed and frozen material shall have a minimum storage life of 42 days at -80 F (-62 C) or lower, or 30 days at -40 F (-40 C) or lower, or 10 days at -10 to -40 F (-23 to -40 C) from date of mix/freeze. The date of mix/freeze shall be within the shelf life of the unmixed
24、material. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3281E Page 4 of 163.6 Properties The base compound and the curing agent, when mixed in accordance with manufacturers instructions and
25、cured in accordance with 4.5.8, shall conform to all requirements shown in Table 1, determined in accordance with the specified test methods. TABLE 1 - PROPERTIES Paragraph Property Requirement Test Procedures (Paragraph) 3.6.1 Nonvolatile Content, by weight, min AS5127/1 (5.1) Class A 85% Cla B 92%
26、 Class C 85% 3.6.2 Viscosity of Base Compound AS5127/1 (5.3) Class A (Use No. 6 spindle at 10 rpm) 100 to 500 poises (10 to 50 Pa S) Class B(Use No. 7 spindle at 2 rpm) 7000 to 16 000 poises (700 to 1600 Pa S) Class C (Use No. 6 spindle at 2 rpm) 1000 to 4000 poises (100 to 400 Pa S) 3.6.3 Viscosity
27、 of Curing Agent (Use No. 7 spindle at 10 rpm) 400 to 1600 poises (40 to 160 Pa S) AS5127/1 (5.4) 3.6.4 FlowClass B Class C, min 0.05 to 0.75 inches (1.2 to 19.0 mm) 0.010 inch (0.25 mm) AS5127/1 (5.5.1) 3.6.5 Application Time, min AS5127/1 (5.6) Class A - From the beginning of mixing, the viscosity
28、 shall not exceed 2500 poise (250 Pa S), (Use No. 7 spindle at 10 rpm) A-1/2A-21/2 hour 2 hours AS5127/1 (5.6.1) Class B - From the beginning of mixing, not less than 15 grams per minute shall be extruded. B-1/2B-21/2 hour 2 hour AS5127/1 (5.6.2) Class C - From the beginning of mixing, not less than
29、 30 grams per minute shall be extruded C-2(2) C-8(24) C-12(48) C-48(168) C-96(336) 2 hours 8 hours 12 hours 48 hours 96 hours AS5127/1 (5.6.2) Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3
30、281E Page 5 of 163.6.6 Assembly Time, min (Class C only) C-2(2) C-8(24) C-12(48) C-48(168) C-96(336 2 hours 24 hours 48 hours 168 hours 336 hours AS5127/1 (5.7) 3.6.7 Tack-Free Time (Measured from beginning of mixing), hours, max A-1/2A-2B-1/2B-2C-2(2) C-8(24) C-12(48) C-48(168) C-96 (336) 10 24 12
31、24 24 96 N/AN/AN/AAS5127/1 (5.9) 3.6.8 Standard Cure Time (time to reach 30 Durometer A), hours, max A-1/2A-2B-1/2B-2C-2(2) C-8(24) C-12(48) C-48(168) C-96 (336) 30 72 32 72 72 168 336 8 weeks 16 weeks AS5127/1 (5.9) 3.6.9 Fluid Immersion Cure Time, min (Class A-1/2 and B-1/2 only) After 48 hours Af
32、ter 120 hours 25 Durometer A 35 Durometer A AS5127/1 (5.11) 3.6.10 Specific Gravity Type 1 Type 2 Type 3 1.20 to 1.35 1.06 to 1.19 1.05 or less AS5127/1 (6.1) 3.6.11 Heat Reversion Resistance, Class B and C only The sealant shall not revert to a liquid or paste-like consistency, nor shall it become
33、brittle or lose adhesion. AS5127/1 (6.5) 3.6.12 Hydrolytic Stability 30 Durometer A AS5127/1 (6.6) 3.6.13 Shaving and Sanding No tearing of the sealant, smooth finish AS5127/1 (6.7) 3.6.14 Paintability No separation from sealant AS5127/1 (6.8) 3.6.15 Weathering No cracking, chalking, peeling or loss
34、 of adhesion AS5127/1 (6.9) Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3281E Page 6 of 163.6.16 Chalking Slight AS5127/1 (7.1) 3.6.17 Resistance to Thermal Rupture, max (Class A and B onl
35、y), Oven air aging at 300 F (149 C), 10 psi (69 kPa), 30 minutes 0.156 inch (3.96 mm) No blistering or sponging AMS3281 (4.6.1) and AS5127/1 (7.2) 3.6.18 Fluid Rupture Resistance, Class B-1/2 only No pressure loss AS5127/1 (7.3) 3.6.19 Weight Loss 2 panels in AMS2629 Type I / 3% saltwater; (All flui
36、d soaks at 140 F (60 C) for 7 days) 20 lbf/inch (3503 N/m)/ 100% cohesive failure AS5127/1 (8.1) 3.6.27.2 Long Term Storage AS5127/1 (9.2) 3.6.27.2.1 Application Time Same as 3.6.5 3.6.27.2.2 Tack-Free Time Same as 3.6.7 3.6.27.2.3 Standard Cure Time Same as 3.6.8 Copyright SAE International Provide
37、d by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3281E Page 8 of 164. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection Shall be in accordance with AS5502 (4.1). 4.1.1 Source Inspection Shall be in accordance with A
38、S5502 (4.1.1). 4.1.2 Sampling Shall be in accordance with AS5502 (4.1.2). 4.2 Classification of Tests Shall be in accordance with AS5502 (4.2). 4.2.1 Qualification Tests All technical requirements listed in Table 1 are qualification tests (See 8.2) and shall be performed on the initial productionof
39、the sealing compound prior to shipment to a purchaser, when a change in ingredients and/or processing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing to be required. 4.2.1.1 Qualification All products sold to this specification shall be listed, or approved for listing,
40、 on the PRI Qualified Products List. The qualified products list shall be in accordance with PD 2000. Class B-2 shall be the first material that is qualified for each supplier of sealing compound in accordance with (8.2). Class B-2 sealing compound shall be tested for, and shall meet all technical r
41、equirements of this specification with the exception of requirements unique to other classes of the sealing compound. 4.2.1.2 Qualification of Subsequent Classes Once qualification for Class B-2 has been obtained, other classes of the sealing compound and application times of qualified classes may b
42、e qualified. The formulation for other classes, and for other application times of qualified classes, shall be the same as Class B-2 except for minor variations necessary for conformance to viscosity and application time requirements. All compounds shall meet all technical requirements of this speci
43、fication. Other classes of the sealing compound need only to be tested to the initial acceptance tests listed in Table 2, plus all peel strength tests listed in Table6, or as defined by purchaser or QPL agency. Application times of qualified classes need only to be tested to the initial acceptance t
44、ests listed in Table 2 or as defined by purchaser or QPL agency. Any unique qualification tests for the sealants class and application time shall also be tested. 4.2.2 Initial Acceptance Tests Requirements shown in Table 2 are initial acceptance tests and shall be performed on each batch. 4.2.3 Fina
45、l Acceptance Tests Shall be in accordance with AS5502 (4.2.3) and Table 3. Requirements shown in Table 3 are final acceptance tests and shall be performed on each lot. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without lice
46、nse from IHS-,-,-SAE AMS3281E Page 9 of 164.3 Sampling and Testing Shall be in accordance with AS5502 (4.3). 4.3.1 Acceptance Tests Shall be in accordance with AS5502 (4.3.1). 4.3.2 Batch and Lot A batch shall be defined as the quantity of material run through a mill or mixer at one time. A lot shal
47、l be defined as material from one batch of each component assembled as finished product in one size and/or type of container at the same time. The lot, when used, shall be traceable to the batches of base compound and curing agent. TABLE 2 - INITIAL ACCEPTANCE TESTS Test Requirement Paragraph Nonvol
48、atile Content 3.6.1 Viscosity of the Base Compound13.6.2 Viscosity of the Curing Agent13.6.3 Flow (Class B only) 3.6.4 Application Time 3.6.5 Assembly Time (Class C only) 3.6.6 Tack-Free Time 3.6.7 Standard Cure Time 3.6.8 Fluid Immersion Cure Time (Class A-1/2 and B-1/2 only) 3.6.9Specific Gravity 3.6.10 Chalking Resistance to Thermal Rupture (Class A and B only) 3.6.16 3.6.17 Weight Loss & Flexibility 3.6.19 Volume Swell 3.6.20 Shear Strength (Class C only) 3.6.23 Peel Strength (See 4.6.3) 3.6.25 1Testing not
